If theres a way to edit it in photoshop or something like that. (not to sure what you can edit files like these in ie in ca you need plugins or to extract the tga. But if you know a way(telling me would be nice ) why not just do a basic edit? this doesent look to hard to replicate. if you want to take the easy route just contrast the purple from dark to light and overlay some webs and a spider. I would think you can tho considering a lot of people did that in CA to change guns from like m4s to scars but I don't quite know if that works anymore I think it doesent. And im pretty sure you need a program to repack the upk but im not 100% sure tbh.